{"id":22926,"url":"https://patchwork.libcamera.org/api/patches/22926/?format=json","web_url":"https://patchwork.libcamera.org/patch/22926/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20250305135256.801351-2-stanislaw.gruszka@linux.intel.com>","date":"2025-03-05T13:52:52","name":"[v6,1/5] libcamera: v4l2_device: add frame start event helpers","commit_ref":null,"pull_url":null,"state":"accepted","archived":false,"hash":"1351e769c398557a8b99a452a5d0225895199aa1","submitter":{"id":211,"url":"https://patchwork.libcamera.org/api/people/211/?format=json","name":"Stanislaw Gruszka","email":"stanislaw.gruszka@linux.intel.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/22926/mbox/","series":[{"id":5046,"url":"https://patchwork.libcamera.org/api/series/5046/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5046","date":"2025-03-05T13:52:51","name":"libcamera: start frame events changes","version":6,"mbox":"https://patchwork.libcamera.org/series/5046/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/22926/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/22926/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 54037C3257\n\tfor ;\n\tWed, 5 Mar 2025 13:53:10 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id DB3096882A;\n\tWed, 5 Mar 2025 14:53:09 +0100 (CET)","from mgamail.intel.com (mgamail.intel.com [198.175.65.13])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 1EAFA68778\n\tfor ;\n\tWed, 5 Mar 2025 14:53:06 +0100 (CET)","from orviesa004.jf.intel.com ([10.64.159.144])\n\tby orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;\n\t05 Mar 2025 05:53:07 -0800","from sgruszka-mobl.ger.corp.intel.com (HELO localhost)\n\t([10.245.112.97]) by orviesa004-auth.jf.intel.com with\n\tESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 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a=\"53134759\"","E=Sophos;i=\"6.14,223,1736841600\"; d=\"scan'208\";a=\"53134759\"","E=Sophos;i=\"6.14,223,1736841600\"; d=\"scan'208\";a=\"123735769\""],"X-ExtLoop1":"1","From":"Stanislaw Gruszka ","To":"libcamera-devel@lists.libcamera.org","Cc":"Milan Zamazal ,\n\tLaurent Pinchart ,\n\tKieran Bingham ,\n\tNaushir Patuck ,\n\tSakari Ailus ,\n\tHans de Goede ","Subject":"[PATCH v6 1/5] libcamera: v4l2_device: add frame start event helpers","Date":"Wed, 5 Mar 2025 14:52:52 +0100","Message-Id":"<20250305135256.801351-2-stanislaw.gruszka@linux.intel.com>","X-Mailer":"git-send-email 2.34.1","In-Reply-To":"<20250305135256.801351-1-stanislaw.gruszka@linux.intel.com>","References":"<20250305135256.801351-1-stanislaw.gruszka@linux.intel.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"Add helper to check if frame start event are supported by subdevice.\nSince kernel does not have interface to query supported events\nuse subscribe interface.\n\nReviewed-by: Kieran Bingham # v3\nReviewed-by: Laurent Pinchart # v5\nSigned-off-by: Stanislaw Gruszka \n---\n include/libcamera/internal/v4l2_device.h | 1 +\n src/libcamera/v4l2_device.cpp | 18 ++++++++++++++++++\n 2 files changed, 19 insertions(+)","diff":"diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h\nindex affe52c2..a647c96a 100644\n--- a/include/libcamera/internal/v4l2_device.h\n+++ b/include/libcamera/internal/v4l2_device.h\n@@ -45,6 +45,7 @@ public:\n \tconst std::string &deviceNode() const { return deviceNode_; }\n \tstd::string devicePath() const;\n \n+\tbool supportsFrameStartEvent();\n \tint setFrameStartEnabled(bool enable);\n \tSignal frameStart;\n \ndiff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp\nindex 2f65a43a..c3e9cd4a 100644\n--- a/src/libcamera/v4l2_device.cpp\n+++ b/src/libcamera/v4l2_device.cpp\n@@ -449,6 +449,24 @@ std::string V4L2Device::devicePath() const\n \treturn path;\n }\n \n+/**\n+ * \\brief Check if frame start event is supported\n+ * \\return True if frame start event is supported, false otherwise\n+ */\n+\n+bool V4L2Device::supportsFrameStartEvent()\n+{\n+\tstruct v4l2_event_subscription event{};\n+\tevent.type = V4L2_EVENT_FRAME_SYNC;\n+\n+\tint ret = ioctl(VIDIOC_SUBSCRIBE_EVENT, &event);\n+\tif (ret)\n+\t\treturn false;\n+\n+\tioctl(VIDIOC_UNSUBSCRIBE_EVENT, &event);\n+\treturn true;\n+}\n+\n /**\n * \\brief Enable or disable frame start event notification\n * \\param[in] enable True to enable frame start events, false to disable them\n","prefixes":["v6","1/5"]}